This is not something with a "source" or a real academic answer. There are too many variables and long tail events. Survival in some of the worst case climate

This is not something with a "source" or a real academic answer. There are too many variables and long tail events. Survival in some of the worst case climate change scenarios involves moving away from the equator where crop failure and extreme heat will occur. It involves having good access to water, and ideally farmland as wars over resources and refugee migration accelerate. Martial law of some kind would become a normalized thing in population centers as basic resources and commodities become more expensive. Seattle has a large military presence. Seattle is positioned geographical well for these things. Being farther north alone is a huge benefit. The mountains of the west due to their proximity to the Pacific enable much more temperate climates than other port cities.